Adjust the line spacing in CSS depending on the length of the text

Upon page load, a ul list is dynamically generated via JavaScript. The relevant code snippet is as follows:

<ul class="tweet_list"><li class="tweet_first tweet_odd"></li></ul>

Related CSS:

​ul.tweet_list li {
    height: 55px;
    line-height: 55px;
    overflow: hidden;
    padding: 0.5em !important;
    vertical-align:middle;
}​

To dynamically adjust the line-height based on the number of words in a tweet (changing from 55px to 24px for tweets with more than 9 words), the following JavaScript code is used:

$(function(){
    var $tweet = $(".tweet_first");
    var $numWords = $tweet.text().split(" ").length;
    if (($numWords >= 1) && ($numWords < 10)) {
        $tweet.css("line-height", "55px");
    }
    else {
        $tweet.css("line-height", "24px");
    }    
});

For a visual representation of the widget, refer to this screenshot:

UPDATE: The current code is not updating the line-height dynamically as intended. How can I directly apply the line-height property to ul.tweet_list li using JavaScript?

UPDATE: To dynamically change the line-height CSS property using JavaScript, the goal is to transition from:

​ul.tweet_list li {line-height: 55px; }​

to:

ul.tweet_list li {line-height: 24px; }​

UPDATE 2: The following code is used to call the tweet:

jQuery(function($){
      $(".tweeter_widget").tweet({
        join_text: "auto",
        username: "twitter_username",
        avatar_size: null,
        count: 1,
        auto_join_text_default: "",
        auto_join_text_ed: "",
        auto_join_text_ing: "",
        auto_join_text_reply: "",
        auto_join_text_url: "",
        loading_text: "loading tweets..."
      });
    }); 

Answer №1

I believe the optimal solution would be:

$(function(){
    var $tweet = $(".tweet_first");
    var $numWords = $tweet.text().split(" ").length;
    if (($numWords >= 1) && ($numWords < 10)) {
        $tweet.css({ "font-size": "55px", "line-height": "55px" });
    }
    else {
        $tweet.css({ "font-size": "24px", "line-height": "24px" });
    }    
});

UPDATE: Upon further reflection, it seems that:

After reviewing the documentation of the plugin you have utilized, it appears that you are able to bind an eventhandler like "loaded", which triggers after the tweet is displayed. Therefore, you should modify your code as follows:

jQuery(function($){
  $(".tweeter_widget").tweet({
    join_text: "auto",
    username: "twitter_username",
    avatar_size: null,
    count: 1,
    auto_join_text_default: "",
    auto_join_text_ed: "",
    auto_join_text_ing: "",
    auto_join_text_reply: "",
    auto_join_text_url: "",
    loading_text: "loading tweets..."
  }).bind("loaded", function() {
    var $tweet = $(".tweet_first"); // perhaps using $(this) would be more suitable
    var $numWords = $tweet.text().split(" ").length;
    if (($numWords >= 1) && ($numWords < 10)) {
        $tweet.css({ "font-size": "55px", "line-height": "55px" });
    }
    else {
        $tweet.css({ "font-size": "24px", "line-height": "24px" });
    }
  });
});

Please give it a try, it has not been tested :)

Answer №2

One issue in your code is that you are adjusting the font-size, consider changing it to:

    $tweet.css("line-height", ...

Other than that, your code looks fine. You can try the following:

....
var $tweet = $(".tweet_main");
var $numWords = $tweet.text().split(" ").length;
alert("number of words: " + $numWords);  // confirm you are receiving a value
alert("number of .tweet_main elements: " + $tweet.length);  // ensure you have an element to modify
...

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